| With the development of computer and communications technology,People's lives are digitized and Intellectualized gradually.In daily lives,digital products are everywhere, and community video intercom system is also a general trend of the figure.Video intercom systems up to date are very strong on their functions.However,there are still some drawbacks.A safe,stable,practical,standard,open network of all-digital intelligent system will be the development direction of the industry.In this paper,a SIP-based visual intercom terminal software system solution of the intelligent community was proposed corresponding to the existing visual intercom terminals' functions and the drawbacks of them.SIP-related technologies were researched in this paper,including the SIP,Session Description Protocol,Real-Time Transport Protocol,voice and video coding standard.A software system for visual intercom terminal was designed and implemented following existing functions,the drawbacks and SIP workflow.The terminal was all-digital,and overcome some of the drawbacks of existing systems,able to monito the specified node,receive information issued by the management center,as well as accomplish communication between arbitrary nodes.Because of the use of standard control protocol,its function could be easily extended and communicate with other SIP-compatible Internet terminal. |
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